28765761511 has 2 divisors, whose sum is σ = 28765761512. Its totient is φ = 28765761510.

The previous prime is 28765761487. The next prime is 28765761517. The reversal of 28765761511 is 11516756782.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28765761511 - 2¹⁹ = 28765237223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28765761517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14382880755 + 14382880756.

It is an arithmetic number, because the mean of its divisors is an integer number (14382880756).

Almost surely, 2^28765761511 is an apocalyptic number.

28765761511 is a deficient number, since it is larger than the sum of its proper divisors (1).

28765761511 is an equidigital number, since it uses as much as digits as its factorization.

28765761511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 49.

The spelling of 28765761511 in words is "twenty-eight billion, seven hundred sixty-five million, seven hundred sixty-one thousand, five hundred eleven".